Re: [Tutor] list objects are unhashable

[Norman Khine]

Thanks,
but where do i replace the x with tuple(x)

Norman

Cédric Lucantis wrote:

Le Monday 30 June 2008 20:55:36 Norman Khine, vous avez écrit :

Hello,

I would like to count list items but am not 100% sure how to do it.

Here is what I have so far:

         for brain in brains:
             x = getattr(brain, horizontal)
             y = getattr(brain, vertical)
             if x and y and (x, y) in table:
                 table[(x, y)] += 1
                 table[(x, '')] += 1
                 table[('', y)] += 1
                 table[('', '')] += 1

but when I run this, I get the following error on the line:

if x and y and (x, y) in table:

TypeError: list objects are unhashable

where:

x = ['airlines-scheduled', 'airport-car-parking']

lists are not hashable because hashing a mutable type would be dangerous, but tuples are if all their items are hashable too. Just replace x by tuple(x).

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